<template>
  <div class="component-upload-image">
    <el-upload
      :action="uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :on-error="handleUploadError"
      name="file"
      :show-file-list="false"
      :headers="headers"
      style="display: inline-block; vertical-align: top"
      :disabled="currentHandle == '详情'"
    >
      <div slot="tip" class="el-upload__tip">图片尺寸控制 {{imageWidth}}*{{imageHeight}}</div>
      <el-image v-if="!valueUrl" :src="valueUrl">
        <div slot="error" class="image-slot">
          <i class="el-icon-plus" />
        </div>
      </el-image>
      <div v-else class="image">
        <el-image :src="valueUrl" :style="`width:150px;height:150px;`" fit="fill" />
        <div class="mask">
          <div class="actions">
            <span title="预览" @click.stop="dialogVisible = true">
              <i class="el-icon-zoom-in" />
            </span>
            <span title="移除" @click.stop="removeImageVideo" v-if="currentHandle != '详情'">
              <i class="el-icon-delete" />
            </span>
          </div>
        </div>
      </div>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible" title="预览" width="800" append-to-body>
      <img :src="valueUrl" style="display: block; max-width: 100%; margin: 0 auto;">
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";

export default {
  data() {
    return {
      dialogVisible: false,
      uploadImgUrl: process.env.VUE_APP_BASE_API + "/uploadImage", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      valueUrl: ''
    };
  },
  props: {
    value: {
      type: String
    },
    imageWidth: {
      type: Number,
      default: 0,
    },
    imageHeight: {
      type: Number,
      default: 0,
    },
    currentHandle:{
      type: String,
      default: "",
    }
  },
  created() {
    if (this.value){
      this.valueUrl = process.env.VUE_APP_BASE_API + this.value;
    }
  },
  methods: {
    removeImageVideo() {
      this.valueUrl = ''
      this.$emit("input", "");
    },
    handleUploadSuccess(res) {
      this.$emit("input", res.url);
      this.valueUrl = process.env.VUE_APP_BASE_API + res.url;
    },
    handleBeforeUpload(file) {
      const isJpg = /image\/(png|jpe?g|gif)$/.test(file.type);
      // const isLt2M = file.size / 1024 / 1024 < 2;
      if (!isJpg) {
        this.$message.error('上传图片只能是 JPG/PNG 格式!');
      }
      // if (!isLt2M) {
      //   this.$message.error('上传图片大小不能超过 2MB!');
      // }
      let width = Number(this.imageWidth);
      let height = Number(this.imageHeight);
      const isSize = new Promise(function(resolve, reject){
        let _URL = window.URL || window.webkitURL;
        let img = new Image();
        img.onload = function(){
          let valid = img.width == width && img.height == height;
          valid ? resolve() : reject();
        }
        img.src = _URL.createObjectURL(file);
      }).then(()=>{
        return file;
      }, ()=>{
        this.$message.error('上传图片的尺寸不对');
        return Promise.reject()
      })
      return isJpg && isSize;
    },
    handleUploadError() {
      this.$message({
        type: "error",
        message: "上传失败",
      });
    },
  },
  watch: {
    value() {
      if (this.value){
        this.valueUrl = process.env.VUE_APP_BASE_API + this.value;
      }
    }
  },
};
</script>

<style scoped lang="scss">
.image {
  position: relative;
  .mask {
    opacity: 0;
    position: absolute;
    top: 0;
    width: 150px;
    height: 150px;
    background-color: rgba(0, 0, 0, 0.5);
    transition: all 0.3s;
  }
  &:hover .mask {
    opacity: 1;
  }
}
</style>
